─────── § 04. NPA RECORD · 503 · FOLIO 0305 OF 0801 ──────────────
503
United States NPA Record
Area code for the northwestern corner of Oregon, including Portland and Salem, originally covering the entire state until 1995.
Area code for the northwestern corner of Oregon, including Portland and Salem, originally covering the entire state until 1995.
IN SERVICEFirst record · 1947
§ 04.05Event Summary
other · 3permissive dialing · 3mandatory dialing · 2boundary change · 1introduced · 1relief planned · 1service expansion · 1split · 1
§ 04.06
Documentary Record · 15 events
CHRONOLOGICAL ORDER
1947-01-01
introduced
NPA 503 assigned to Oregon
In 1947, area code 503 was assigned as one of the original North American area codes, covering the entire state of Oregon.
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1995-05-19
other
NANP-SPLIT OF 503 (OREGON) NUMBERING PLAN AREA (NPA)
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1995-11-05
split
NPA 503 split to create 541
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1999-07-11
permissive dialing
Permissive 10-digit dialing begins for 503/971 overlay
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1999-07-21
other
Concentrated Overlay of 503 (Oregon) NPA with 971 NPA
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1999-07-21
relief planned
971 overlay relief plan announced for 503
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1999-12-10
permissive dialing
Permissive Dialing Extended for the 503 / 971 Concentrated Overlay (Oregon)
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2000-10-01
NPA 971 overlay activated for 503
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2000-10-01
mandatory dialing
Mandatory 10-digit dialing for 503/971 overlay
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2006-12-21
other
Expansion of Concentrated NPA 971 Overlay with NPA 503 (Oregon)
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2007-10-21
permissive dialing
Permissive 10-digit dialing for overlay expansion to Clatsop and Tillamook counties
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2008-04-27
service expansion
971 overlay expanded to Clatsop and Tillamook counties
On April 27, 2008, the area code 971 overlay was expanded to include Clatsop and Tillamook counties, completing the overlay coverage for the entire 503 region.
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2008-04-27
mandatory dialing
Mandatory 10-digit dialing for overlay expansion to Clatsop and Tillamook counties
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2008-04-27
Overlay of 503 with 971 in Oregon
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2008-04-27
boundary change
Clatsop and Tillamook counties added to 971 overlay
Clatsop and Tillamook counties were added to the 971 overlay on April 27, 2008, expanding the overlay to cover the entire 503 numbering plan area.
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